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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9971aeb65539b0f99a712cc3de0125cab34ef35316db37bca50cc8576e5afa4' 
  AND token = 'u4ovpBU5Jl6PIf7xKAkyGqV5aFP07IrP8ATdAa13KX8=' 
  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"
    }
  }
}