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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bbbc1b0f97c5da2a40e851b68a5b6c49a2f3b1032e4a10c51ca1fccc0bbccc' 
  AND token = '5rkUpO7lD+u2V1nGT98EN31Jl2r+qFe8onbJXk/ADU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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