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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecca9416e29549cd22acf134c321bf5e0cc402f037bfbbdec51ebd9fa0c1d3a6' 
  AND token = 'L97vdJgDF6BgLWIL8DpqOeNEWe22deyvcKjSOQdG+RA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}