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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2bbc892bb0b3069b34bc911fd8452f84a1dbe3adb44435cf37228dc60763ab6' 
  AND token = '9WsBwbdhV9p/ZLdtnC2qaw1y3tnnCRLU9ISb+hpAlOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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